Several types of β-ketoamino based N,O-coordinate half-sandwich ruthenium complexes have been synthesized in moderate to good yields. The stable ruthenium complexes displayed good and diverse catalytic efficiency in reductive amination between aldehydes and amines in aqueous solution. The method gave a facile route for one-pot synthesis of diverse complicated amines with a low catalyst loading by using cheap and less-toxic HCOOH or clean H₂ as hydrogen source. Catalyst Ru1 showed the highest catalytic activity of 190 h^–1 TOF value in the reductive amination reaction of benzaldehyde with aniline. The corresponding amine products were furnished in excellent yields under the standard catalysis system. The efficient and diverse catalytic activity, broad substance scope, mild conditions, and environmentally benign solvent made this system potentially applicable in industrial production. Ruthenium complexes were characterized using NMR, elemental analysis, and IR techniques to confirm their structure.

中文翻译：

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N，O-螯合配体的半三明治Ru（II）配合物：水中胺合成的多种催化活性

已经以中等至良好的产率合成了几种类型的基于β-酮氨基的N，O-配位半三明治钌络合物。稳定的钌络合物在水溶液中的醛和胺之间的还原胺化反应中表现出良好的催化效率。该方法通过使用廉价且毒性较小的HCOOH或干净的H ₂作为氢源，为一锅法合成具有低催化剂负载量的多种复杂胺提供了一条简便的途径。催化剂Ru1表现出190 h ^–1的最高催化活性苯甲醛与苯胺的还原胺化反应中的TOF值。在标准催化体系下，相应的胺产物以优异的产率提供。有效和多样化的催化活性，广泛的物质范围，温和的条件以及对环境无害的溶剂使该系统潜在地可用于工业生产。使用NMR，元素分析和IR技术对钌配合物进行表征，以确认其结构。